Exhibit 99.1

Magnachip Reports Results for First Quarter 2022

SEOUL, South Korea, May 3, 2022 — Magnachip Semiconductor Corporation (NYSE: MX) (“Magnachip” or the “Company”) today announced financial results for the first quarter of 2022.

Commenting on the results for the first quarter of 2022, YJ Kim, Magnachip’s chief executive officer stated, “In Q1, we reported revenue of $104.1 million and non-GAAP EPS of 28 cents, which was an increase of 27% year-over-year bolstered by a strong gross profit margin. As expected, OLED revenue remained severely impacted by the shortage of 28nm 12-inch wafer supply; however, this impact was somewhat offset by strength in our Power solutions business, which achieved yet another record quarterly revenue.”

YJ Kim continued, “Looking forward, the ongoing lockdowns in China have added new challenges to an already stressed supply chain. Despite the current macro issues, which may limit our near-term growth, our recent design tractions with an existing OLED customer, broadening customer base, and new wafer capacity later this year give us confidence and optimism about our long-term growth.”

Q1 2022 Financial Highlights

Q2 2022 Financial Guidance

Our near-term outlook is still being challenged by persisting supply constraints, especially for 28nm 12” wafers. While actual results may vary, looking into the next quarter, Magnachip currently expects:

Q1 2022 Earnings Conference Call

Magnachip will host a corresponding conference call at 2:00 p.m. PT / 5:00 p.m. ET on May 3, 2022 to discuss its financial results. The conference call will be webcast live and also is available by dialing toll-free at 1-844-536-5472 in US/Canada. International call-in participants can dial 1-614-999-9318. The conference ID number is 2619959. Participants are encouraged to initiate their calls at least 10 minutes in advance of the start time to ensure a timely connection. A live and archived webcast of the conference call and a copy of earnings release will be accessible from the ‘Investors’ section of the company’s website at www.magnachip.com. A replay of the conference call will be available until 8:00 p.m. ET on May 10, 2022. The replay dial-in numbers are 1-404-537-3406 or toll-free at 1-855-859-2056. The conference ID number is 2619959.

Safe Harbor for Forward-Looking Statements

Information in this release regarding Magnachip’s forecasts, business outlook, expectations and beliefs are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that involve risks and uncertainties. These statements include expectations about estimated historical or future operating results and financial performance, outlook and business plans, including second quarter 2022 revenue and gross profit margin expectations, and the impact of the COVID-19 pandemic or the emergence of various variants of the virus, escalated trade tensions and supply constraints on Magnachip’s second quarter 2022 and future operating results. All forward-looking statements included in this release are based upon information available to Magnachip as of the date of this release, which may change, and we assume no obligation to update any such forward-looking statements. These statements are not guarantees of future performance and actual results could differ materially from our current expectations. Factors that could cause or contribute to such differences include, among others: the impact of changes in macroeconomic and/or general economic conditions, including those caused by or related to the COVID-19 pandemic or the emergence of various variants of the virus and governmental lock-downs or other measures implemented in response thereto, other outbreaks of disease, the Russia-Ukraine crisis, recessions, economic instability or civil unrest; manufacturing capacity constraints or supply chain disruptions that may impact our ability to deliver our products or affect the price of components, which may lead to an increase in our costs, as well as impacting demand for our products from customers who are similarly affected by such capacity constraints or disruptions; the impact of competitive products and pricing; timely design acceptance by our customers; timely introduction of new products and technologies; ability to ramp new products into volume production; industry wide shifts in supply and demand for semiconductor products; industry and/or company overcapacity or supply constraints; effective and cost efficient utilization of manufacturing capacity; financial stability in foreign

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markets and the impact of foreign exchange rates; unanticipated costs and expenses or the inability to identify expenses which can be eliminated; compliance with U.S. and international trade and export laws and regulations by us, our customers and our distributors, including those related to the Russia-Ukraine crisis; change or ratification of local or international laws and regulations, including those related to environment, health and safety; public health issues, including the COVID-19 pandemic or the emergence of various variants of the virus; other business interruptions that could disrupt supply or delivery of, or demand for, Magnachip’s products, including uncertainties regarding the impacts of the COVID-19 pandemic or the emergence of various variants of the virus that may result in factory closures, reduced workforces, scarcity of raw materials and goods produced in infected areas, as well as reduced consumer and business spending affecting demand for Magnachip’s products due to government and private sector mandatory business closures, travel restrictions or the like to prevent the spread of disease; and other risks detailed from time to time in Magnachip’s filings with the U.S. Securities and Exchange Commission (the “SEC”), including our Form 10-K filed on February 23, 2022 (including that the impact of the COVID-19 pandemic or the emergence of various variants of the virus, trade tensions and supply constraints may also exacerbate the risks discussed therein) and subsequent registration statements, amendments or other reports that we may file from time to time with the SEC and/or make available on our website. Magnachip assumes no obligation and does not intend to update the forward-looking statements provided, whether as a result of new information, future events or otherwise.

About Magnachip Semiconductor

Magnachip is a designer and manufacturer of analog and mixed-signal semiconductor platform solutions for communications, IoT, consumer, computing, industrial and automotive applications. The Company provides a broad range of standard products to customers worldwide. Magnachip, with more than 40 years of operating history, owns a portfolio of approximately 1,150 registered patents and pending applications, and has extensive engineering, design and manufacturing process expertise. For more information, please visit www.magnachip.com. Information on or accessible through Magnachip’s website is not a part of, and is not incorporated into, this release.

CONTACTS:

Yujia Zhai

The Blueshirt Group

Tel. (860) 214-0809

Yujia@blueshirtgroup.com

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands of U.S. dollars, except share data)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands of U.S. dollars, except share data)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands of U.S. dollars)

(Unaudited)

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF OPERATING INCOME (LOSS) TO ADJUSTED OPERATING INCOME

(In thousands of U.S. dollars)

(Unaudited)

We present Adjusted Operating Income as a supplemental measure of our performance. We define Adjusted Operating Income for the periods indicated as operating income (loss) adjusted to exclude (i) Equity-based compensation expense, (ii) Inventory reserve related to Huawei impact of downstream trade restrictions, (iii) Merger-related costs (income), net and (iv) Other charges, net.

For the three months ended December 31, 2021, we recorded in our consolidated statement of operations net gain of $49,369 thousand that represented income of $70,200 thousand from the recognition of a reverse termination fee, net of professional service fees and expenses of $20,831 thousand incurred in connection with the contemplated merger transaction of the Company that was terminated in December 2021. For the same period, we also recorded $1,419 thousand gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi (which was closed during the year ended December 31, 2018), partially offset by $70 thousand of non-recurring expenses incurred in connection with the regulatory requests.

For the three months ended March 31, 2021, we recorded $9,831 thousand non-recurring professional service fees and expenses incurred in connection with the contemplated merger transaction. For the same period, we also recorded $585 thousand non-recurring professional service fees and expenses incurred in connection with the regulatory requests.

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MAGNACHIP SEMICONDUCTOR CORPORATION AND SUBSIDIARIES

RECONCILIATION OF NET INCOME (LOSS) TO ADJUSTED EBITDA AND ADJUSTED NET INCOME

(In thousands of U.S. dollars, except share data)

(Unaudited)

We present Adjusted EBITDA and Adjusted Net Income as supplemental measures of our performance. We define Adjusted EBITDA for the periods indicated as EBITDA (as defined below), adjusted to exclude (i) Equity-based compensation expense, (ii) Foreign currency loss (gain), net, (iii) Derivative valuation loss (gain), net, (iv) Inventory reserve related to Huawei impact of downstream trade restrictions, (v) Merger-related costs (income), net and (vi) Other charges, net. EBITDA for the periods indicated is defined as net income (loss) before interest expense (income), net, income tax expense and depreciation and amortization.

We prepare Adjusted Net Income by adjusting net income (loss) to eliminate the impact of a number of non-cash expenses and other items that may be either one time or recurring that we do not consider to be indicative of our core ongoing operating performance. We believe that Adjusted Net Income is particularly useful because it reflects the impact of our asset base and capital structure on our operating performance. We define Adjusted Net Income for the periods as net income (loss), adjusted to exclude (i) Equity-based compensation expense, (ii) Foreign currency loss (gain), net, (iii) Derivative valuation loss (gain), net, (iv) Inventory reserve related to Huawei impact of downstream trade restrictions, (v) Merger-related costs (income), net, (vi) Other charges, net, (vii) GAAP and cash tax expense difference and (viii) Income tax effect on non-GAAP adjustments.

For the three months ended December 31, 2021, we recorded in our consolidated statement of operations net gain of $49,369 thousand that represented income of $70,200 thousand from the recognition of a reverse termination fee, net of professional service fees and expenses of $20,831 thousand incurred in connection with the contemplated merger transaction of the Company that was terminated in December 2021. For the same period, we also recorded $1,419 thousand gain on sale of certain legacy equipment of the closed back-end line in our fabrication facility in Gumi (which was closed during the year ended December 31, 2018), partially offset by $70 thousand of non-recurring expenses incurred in connection with the regulatory requests.

For the three months ended March 31, 2021, we recorded $9,831 thousand non-recurring professional service fees and expenses incurred in connection with the contemplated merger transaction. For the same period, we also recorded $585 thousand non-recurring professional service fees and expenses incurred in connection with the regulatory requests.

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